Attachment for jewelers&#39; lathes.



I. GREENWALD & I. HARRISON. ATTACHMENT FOR JEWEIJEES LATHE-S. APPLICATION FILED A G. 2, 1909.

965,105. Patented July 19, 1910.

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ATTACHMENT FOR JBWELERS LATHBS.

APPLICATION FILED we. 2, 1909. 1

.965, 105. Patented July 19, 1910. v 2 SHEETS-SHEET 2.

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ISIDOR GREENWALD AND ISAAC HARRISON, OF PITTSBURG, PENNSYLVANIA.

ATTACHMENT FOR JEWELERS LATHES.

Specification of Letters Patent.

Application filed. August 2, 1909.

Patented July 19, 1910.

Serial No. 510,906.

To all whom it may concern:

Be it known that we, (1) IsIDoR GREEN- WALD and (2) ISAAC HARRISON, (1) a subject of the King of Hungary, (2) a citizen of the United States of America, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Attachments for Jewelers Lathes, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to attachments for jewelers lathes, and more particularly to a device for grinding and polishing the spindles of balance wheels, gear wheels and such other wheels as are used in the art of horol- The object of the invention is to provide a lathe attachment with simple and effective means for gripping and revolubly supporting the spindle of a wheel, whereby the wheel can be revolved during the operation of grinding or polishing the spindle thereof.

Another object of this invention is to provide a lathe attachment with an adjustable spindle holder adapted to steady and support a spindle while being operated upon by a grinding or polishing element.

A further object of this invention is to 1provide a lathe with a revoluble horizontally eld grinding or polishing element adapted to operate upon a revoluble longitudinally held spindle.

\Vith the above and other objects in view which will more readily appear as the invention is better understood, the same consists in the novel construction, combination and arrangement of parts to be hereinafter described in detail and then claimed.

Reference will now be had to the drawings, wherein there is illustrated a lathe equipped with our improved attachment, but it is to be understood that the structural elements thereof can be varied or changed, as to the size, shape and manner of assemblage without departing from the spirit of the invention.

In the drawings :-Fi ure 1 is a front elevation of a lathe provided with our attachment, Fig. 2 is a diagrammatic plan of the lathe illustrating the manner in which the same is driven, Fig. 3 is an enlarged sectional view of a portion of the lathe attachment, Fig. 4 is a horizontal sectional view of a portion of the attachment taken on the line X-X of Fig. 3, Fig. 5 is an elevation of a spindle rod, partly broken away and partly in section, Fig. 6 is a plan of a horizontal spindle holder, Fig. 7 is a side elevation of the same, Fig. 8 1s a plan of a polishing head forming part of the attachment, Fig. 9 is a side elevation of the same, Fig. 10 is an enlarged elevation of a chuck forming part of the attachment, and Fig. 11 is an end View of the same.

In the drawings 1 denotes a table, bench or similar support provided with a pedestal 2 supporting a horizontal lathe bed 3, and adjustably mounted upon said lathe bed is a headstock a and a tail-stock 5, the former having bearings 6 and the latter a longitudinal bore 7. These parts are common to any ordinary jewelers lathe.

8 denotes heads revolubly mounted in the bearings 6, said heads being provided with longitudinal bores 9 communicating with a sleeve 10 connecting the heads 8. Upon the sleeve 10 is mounted a stepped pulley 11 over which is adapted to travel an endless belt 12 employed for revolving the pulley 11 through the medium of a driven shaft 13. The head 8 at the inner end of the stock 4: is provided with a conical shaped recess 14 communicating with the bore 9, and in said recess is de tachably mounted a chuck 15. One end of the chuck is reduced and threaded, as at 16 to screw into an adjustable tubular rod 17 extending through the sleeve 10 and the outermost head 8 and having the opposite end thereof provided with a hand wheel 18, whereby said tubular rod can be rotated and then looked through the medium of a jam nut 19 located adjacent to the outermost bearings 6 of the stock 4. The chuck 15 is provided with a conical shaped head 20 and is also provided with three longitudinal equally spaced slits or slots 21 allowing the slitted parts of the chuck to be sprung into frictional engagement with a spindle rod 22 located longltudinally of said chuck. The head 20 is adapted to engage in the recess 14: and by rotating the hand wheel 18, the head 20 can be drawn into the recess to force the slitted portions of the chuck into engagement with the spindle rod 22. The jam nut 19 can then be set to hold the chuck in its adjusted position.

The spindle rod 22 is provided with tapered ends 23 having longitudinal sockets 24 and 25, the socket 24 being of a less diameter than the socket 25, whereby the spindle can be used for holding spindles to two different sizes, it being only necessary to re verse the spindle rod in the chuck 15 when it is desired to use the large socket 25. For fear that the socket should become clogged either by a broken off spindle or foreign matter, the tapered ends of the spindle rod are provided with openings 26 communicating with the sockets 24 and 25.

27 denotes a collar adapted to fit upon the protruding end of the spindle rod 22 against the conical shaped head 20 of the chuck 15. The collar 27 is provided with a peripheral flange 28 having a set screw 29 for holding the collar in engagement with the spindle rod 22. The collar 28 is also provided with forwardly extending pins 30 adapted to engage a spoke of a toothed wheel 31, said wheel having one of the spindles thereof mounted in the socket 24 of the spindle rod 22.

33 denotes a rod adjustably mounted within the bore 7 of the tail-stock 5, said rod be ing held by set screw 34. One end of the rod is provided with a knob 35 whereby it can be easily moved, while the opposite end is provided with a rest 36 having a horizontal portion 37. The horizontal portion 37 is provided with a vertical opening 38 for the reduced end 39 of a collar 40, said collar being held within the horizontal portion 37 by a set screw 41.

42 denotes a Vertical shaft revolubly mounted in the collar 40, said shaft extending downwardly into a longitudinal slot 43 provided therefor in the bed 3 of the lathe, said slot assisting in maintaining the shaft in a vertical position. Fixed to the shaft 42 by a set screw 44 is a hub 45 of a horizontal ratchet wheel 46, said ratchet wheel resting upon the reduced end 39 of the collar 40 and supporting the shaft 42 in said collar. The ratchet wheel 46 is provided with V-shaped teeth 47 adapted to be engaged by a pawl 48 pivotally connected, as at 49 at one side of the rest 36. A coil spring 50 is arranged between the rear side of the pawl 48 and the front side of the rest 36 for normally holding said pawl in engagement with the ratchet wheel 46.

51 designates the hub of a horizontal circular spindle holder 52, said hub fitting over the hub 45 of the ratchet wheel 46 and is slitted, as at 53 to provide clearance for the set screw 44, this set screw causing the hubs 45 and 51 to move in unison. The upper face of the spindle holder 52 is provided with a plurality of radially disposed grooves 54, these grooves being semicylindrical and of various sizes for holding spindles of various sizes. In order that the spindle holder can be adjusted to properly hold any other spindle of a wheel the vertical shaft 42 directly beneath the collar 40 is provided with a knurled hand wheel 55, which is fixed to the shaft 42 by a set screw 56.

57 denotes a cylindrical cap revolubly mounted upon the upper end of the shaft 42. Intermediate the ends of the cap 57 is a pcripheral flange 58 and mounted upon the lower end of the cap below the flange 58 is the hub 59 of a tool 60, which may be a circular polishing head or a circular grinding head, depending upon whether the spindle is to be polished or ground. As shown the element 60 is a polishing head. The hub 59 is provided with a bayonet shaped slot 61 to receive a screw 62 carried by the cap 57.

63 designates a horizontal pulley shrunk or otherwise fixed upon the cap 57 above the flange 58. Adapted to travel over the horizontal pulley 63 is a belt 64 driven through the medium of the shaft 13. The cap 57 is provided with a reduced end 65 having an annular groove 66. Loosely mounted upon the reduced end 65 is a button 67 retained in engagement with the reduced end of the cap by a set screw 68.

Prior to placing the machine in operation, the manner of placing the toothed wheel 31 in position is as follows :Vith the headstock 4 moved a sufficient distance from the rest 36 of the tail-stock 5, the spindle rod 22 can be positioned so that either the socket 24 or 25 will confront the rest 36 and can be used for holding the spindle 32 of the wheel 31. After the spindle rod 22 has been correctly positioned through the medium of the tubular rod 17 and the hand Wheel 18, the hand wheel can be rotated to draw the head 28 of the chuck 15 into the recess 14 and frictionally hold the spindle rod. The jam nut 19 can then be set to hold the chuck in its adjusted position. Through the medium of the hand wheel 55 the shaft 42 can be rotated to present the proper groove 54 for holding the spindle 54, whereby said spindle can be revolved.

Assuming that the shaft 13 is driven from a suitable source of energy, as a motor, the heads 8 of the sleeve 10 will be revolved, and as the spindle rod 22 is fixed in one of said heads, said rod will be rotated. Since the wheel 31 is partially supported by said rod and the pins 30 engage said wheel, the wheel will be rotated in unison with the rod 22 and the head 8 holding said rod. With the shaft 13 in operation, the cylindrical cap 57 is revolved through the medium of the belt 64 and the pulley 63. The polishing or grinding head 60 will rotate with the cap 57 and polish the spindle 54 which revolves upon the holder 52. The centrifugal force of the cap 57 is liable to elevate said cap, and the button 67 has been provided whereby the operator or attendant of the lathe can place the hand upon the button 67 and hold the cap in a lowered position with the polishing or grinding head engaging the spin dle. It is possible through the medium of the button 67 to elevate the polishing or grinding head and permit of the condition of the spindle 54: being observed.

It is apparent that the elements 27, to 30 inclusive constitute a lock for causing the wheel 31 to rotate in unison with the spindle rod, that the elements 8, 10, and 15 constitute means for clamping and revolving the spindle rod, that the elements 36, 40, 46, 52 and 55 constitute means for adjustably sup porting the spindle to be polished, and that the elements 57, 63 and 60 constitute means for polishing or grinding the spindle.

An important characteristic of our invention resides in the fact that pivots or spindles of various lengths can be easily and quickly polished by our lathe attachment. In the art of horology, wheels and other devices are used which are minute and which have pivots or spindles that do not extend beyond the rim or peripheries of the wheels. This is particularly true in connection with some types of balance wheels. It is the present practice to use a file for grindmg and polishing the pivots or spindles, and considerable trouble is experienced in not being able to reach the pivots orspindles owing to the teeth of the wheel or the rim thereof interfering with a filing movement.

Our machine eliminates the above trouble, since the head of the spindle holder is circular, also the polishing or grinding element, consequently the edges of these two elements will not interfere with a wheel when presented for polishing or grinding.

Having now described our invention, what we claim as new, is

1. In a lathe attachment, a spindle rod adapted to support one of the spindles of a wheel, means for revolving said rod and the spindle supported thereby, a horizontal adjustable holder adapted to support the other spindle of the wheel, and a horizontal polishing or grinding head located above sa1d holder and adapted to operate upon the spindle supported thereby.

2. In a lathe attachment, a reversible spindle rod adapted to support one of the spindles of a wheel, a chuck for holding said rod, means adapted to revolve said chuck, a horizontal adjustable holder for supporting the other spindle of the wheel, a horizontal polishing or grinding head located above said holder adapted to operate upon the spindle supported thereby, and means for revolving said head.

3. In alathe attachment, a revoluble spindle rod adapted to hold one of the spindles of a wheel, a horizontal holder adapted to hold the other spindle of the wheel, means for adjusting said holder, a polishing and grinding head revolubly mounted above said.

holder and adapted to operate upon the spindle carried by said holder.

4-. In a lathe attachment, the combination with a head-stock and a tail-stock, of a revoluble spindle rod detachably supported by said head-stock and adapted to hold the spindle of a wheel, a rest carried by said tail-stock, a spindle holder adjustably supported by said rest adapted to hold the other spindle of a wheel, and a revolving polishing and grinding head arranged above said holder and adapted to operate upon the spindle supported thereby.

5. In a lathe attachment, the combination with the head-stock and tail-stock, and a rest carried by said tail-stock, of a revoluble spindle rod detachably supported by said head-stock and adapted to hold the spindle of a wheel, an adjustable spindle holder supported by said rest and adapted to hold the other spindle of a wheel, means carried by said rest for locking said holder in a fixed position, and a revoluble polishing and grinding head located above said holder and adapted to operate upon the spindle supported thereby.

6. In a lathe attachment, the combination with a head-stock, a tail-stock, and a rest supported by spindle rod revolubly held by said headstock and adapted to support the spindle of a wheel, a vertical shaft revolubly supported by said rest, a spindle holder mounted upon said shaft and adapted to support the other spindle of a wheel, means in connection with said shaft and said rest for adjusting and locking said holder in a fixed posi tion, a revoluble polishing and grindin head arranged upon said shaft and adapted to operate upon the spindle supported by said holder, and means for revolving said polishing and grinding head.

7. The combination with the head-stock, tail-stock and rest of a lathe, of a detachable and reversible spindle rod revolubly carried by said head-stock and adapted to support one of the spindles of a wheel, means carried by said rod and adapted to cause the wheel to rotate therewith, an adjustable spindle holder carried by said rest and adapted to support the other spindle of the wheel, and a revoluble polishing and grinding head located above said holder and adapted to operate upon the spindle supported thereby.

8. In a lathe attachment, the combination with a head-stock, a tailstock, a rest carried by said tail-stock, and a wheel having spindles adapted to be operated upon by said attachment, of a revoluble spindle rod carried by said head-stock for supporting one of the spindles of said wheel, means carried by said rod for causing said wheel to rotate therewith, an adjustable spindle holder carsaid tailstock, a reversible ried by said rest and adapted to sup ort the other spindle of said wheel, said holder comprising. a ratchet wheel, a circular head and connected thereto and provided with radially disposed grooves of various sizes adapted-to support various sizes of spindles, a spring pressed pawl for holding the ratchet wheel of said holder in a fixed position, and a revoluble polishing and grinding head located above said holder for operating 10 upon the spindle supported by said holder.

In testimony whereof we aflix our signatures in the presence of two Witnesses.

ISIDOR GREEN \VALD. ISAAC HARRISON. lVitnesses KARL H. BUTLER,

A. T. PAYNE. 

